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Table 6 Estimated coefficients for real and codified values of independent variables (inhibitors) were fixed by applying the fractionated factorial design 25−2

From: Statistical prediction of interactions between low concentrations of inhibitors on yeast cells responses added to the SD-medium at low pH values

Variables (mmol/L) Symbols Values and ranges (mmol/L)
(− 1) (+ 1)
Acetic acid X 1 5.0 20.0
Formic acid X 2 5.0 15.0
Levulinic acid X 3 10.0 35.0
Furfural X 4 10.0 30.0
Vanillin X 5 5.0 10.0
  1. X1 (acetic acid), X2 (formic acid), X3 (levulinic acid), X4 (furfural), and X5 (vanillin)